NO. 2055. 



MARIXE MOLLUSKS— HENDERSON AND BARTSCH. 413 



CARDIUM ROBUSTUM Solander=CARDIUM MAGNUM Bom. 



LiEVICARDIUM MORTONI Conrad. 



VENUS MERCENARIA Linnaeus. 



CHIONE CANCELLATA Linnaeus. 



AGRIOPOMA CONVEXA Say. CYTHEREA CONVEXA Say. CALLOCARDIA MORRHUANA 



Lindsay. 

 PETRICOLA PHOLADIFORMIS Lamarck. 

 DONAX VARIABILIS Say. 

 TAGELUS GIBBUS Spengler. 

 TAGELUS DIVISUS Spengler. 

 ANGULUS TENERA Say. 

 PSAMMACOMA TENTA Say. 



Two fuiiiy distinct forms of this occur which for the present may- 

 be called the southern and northern varieties. 



ABRA AEQUALIS Say. 



SPISULA (HEMIMACTRA) SOLIDISSIMA DUlwyn. 



SPISULA SOLIDISSIMA SIMILIS Say. 



SPISULA SOLIDISSIMA RAVENELI Conrad. 



MULINLA. LATERALIS Say. 



LABIOSA (RAETA) CANALICULATA Say. 



LYONSIA HYALINA Conrad. 



CORBULA CONTRACTA Say. 



MYA ARENARLA. Linnaeus. 



ENSIS MINOR Dall. 



PHOLAS (BARNEA) COSTATUS Linnaeus. 



TORNATINA CANALICULATA Say. 



CYLICHNELLA BIPLICATA H. C. Lee. 



Not C. Udentata Orbigny, generally accepted as synonomous. 



TEREBRA CONCAVA Say. 

 TEREBRA DISLOCATA Say. 

 CLATHURELLA JEWETTI Steams (typical). 

 MANGILIA, CERINA Kurtz and Stimpson. 

 MANGILIA, species. 



A single specimen of what will probably prove to be a new species 

 was found on the beach at Assateague Bight. This shell is too worn 

 to be properly described. 



MARGINELLA APICINA BOREALIS Verrill. 

 FULGUR PERVERSA Linnaeus. 



Very young specimens only. 



FULGUR CARICA Linnaeus. 

 SYCOTYPUS CANALICULATUS Say. 

 TRITIA TRIVITTATA Say. 

 NASSA OBSOLETA Say. 

 NASSA VIBEX Say. 



Exceptionally large race. 



COLUMBELLA (ANACHIS) AVARA Say (typical). 



Large, sohd, dingy colored, with 10 to 12 prominent ribs. 



COLUMBELLA (ASTYRIS) LUNATA Say. 



Specimens from the same haul of the dredge vary greatly in color 

 patterns from light with dark maculations to dark with light macu- 

 lations to sohd reddish brown; the latter is suggestive of Stimpson's 



